Abstract
The anisotropy of the angular distribution of gamma-rays from the decay of156Tb, oriented in a gadolinium matrix at low temperatures, has been measured at the angles of 0 and π/2 with respect to the applied magnetic field direction in the range of temperatures from 14·6 to 68·4 mK. The temperature dependence of anisotropy was measured for the first time. The parameters of hyperfine magnetic dipole and electric quadrupole splittings have been determined and the values of the magnetic dipole moment ¦Μ156¦=(9·6±1·3)×10−27 J/T and the electric quadrupole momentQ 156=(2·9±0·9)×10−28 m2 of the156Tb ground state have been calculated. Multipole mixing ratios andB(E2) branching ratios of many gamma-ray transitions occurring in156Gd have been found and the results have been discussed in terms of the rotational-vibration and pairing-plus-quadrupole models.
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The authors are indebted to I. I.Gromova for mass-separation of the measured samples, to V. M.Tsupko-Sitnikov and M. I.Fominikh for help with the arrangement of the experimental equipment and data transmission, to J.Gavor and V.Deriuga for assistance in the data processing and to Dr. M.Odehnal for reading the manuscript and valuable remarks.
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Říkovská, J., Machová, A., Hamilton, W.D. et al. Nuclear orientation of156Tb in gadolinium matrix. Czech J Phys 29, 620–639 (1979). https://doi.org/10.1007/BF01600013
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DOI: https://doi.org/10.1007/BF01600013